General science

General science

A variety of science subjects concerning the fundamental knowledge about different aspects of our world and their underlying principles.

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General science

A class of Echinozoa characterized by a cylindrical body and smooth leathery skin, and known as sea cucumbers. There are no arms, but a ring of five or more tentacles may surround the mouth, which ...

sigma-delta converter

Science; General science

A class of electronic systems containing both analog and digital subsystems whose most common application is to the conversion of analog signals to digital form and vice versa. The device is also ...

earphones

Science; General science

A class of energy transducers capable of receiving alternating current and generating acoustic waves resembling very closely the characteristics of that current. The movement of an element ...

edrioasteroidea

Science; General science

A class of extinct Echinozoa which arose early in Cambrian times and died out before the end of the Carboniferous Period. They resemble the other Echinozoa in having the ambulacral radial areas ...

blastoidea

Science; General science

A class of extinct Pelmatozoa in the subphylum Blastozoa which arose in the Ordovician and flourished in the Carboniferous and Permian. Blastoids did not survive the Permo-Triassic mass extinction ...

ferrimagnetic garnets

Science; General science

A class of ferrimagnetic oxide materials that have the garnet crystal structure. The crystal structure contains three types of nonequivalent sites in the oxygen lattice which are occupied by metal ...

shale

Science; General science

A class of fine-grained clastic sedimentary rocks with a mean grain size of less than 0.0625 mm (0.0025 in.), including siltstone, mudstone, and claystone. One-half to two-thirds of all sedimentary ...